When the South Napa Quake shook this town two weeks ago, inspectors red-tagged a building downtown and shut down an entire block. That sudden loss of foot traffic has merchants wondering if the end is near.

Seismic activity continues more than four days after a magnitude 6.0 earthquake rocked the southern end of Napa County on Sunday. Between Wednesday morning and day break Tuesday eight more aftershocks hit the region, which runs along the border with Solano County.